Analysis of South Asian Monsoons within the Context of Increasing Regional Black Carbon Aerosols

South Asian monsoons were analyzed within the context of increasing emissions of black carbon (BC) aerosols using a global atmospheric general circulation model. The BC aerosols were allowed to increase only over the south Asian domain to analyze the impacts of regional black carbon over the climato...

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Published in:Atmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao Vol. 3; no. 4; pp. 224 - 231
Main Authors: Mahmood, Rashed, Shuanglin, Li, Jin-Feng, Yao
Format: Journal Article
Language:English
Published: Routledge 01.01.2010
Nansen-Zhu International Research Centre,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China
Subjects:
BC aerosols
convection
monsoon
South Asia
temperature gradients
convection
monsoon
BC aerosols
temperature gradients
South Asia
ISSN:1674-2834, 2376-6123
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Abstract South Asian monsoons were analyzed within the context of increasing emissions of black carbon (BC) aerosols using a global atmospheric general circulation model. The BC aerosols were allowed to increase only over the south Asian domain to analyze the impacts of regional black carbon over the climatological patterns of monsoons. The black carbon significantly absorbed the incoming short wave radiation in the atmosphere, a result that is consistent with previous studies. Pre-monsoon (March-April-May) rainfall showed positive anomalies, particularly for some coastal regions of India. The summer (June-July-August) rainfall anomalies were negative over the northern Himalayas, Myanmar, southern China, and most of the regions below 20°N due to the decrease in temperature gradients induced by the absorption of radiation by BC aerosols. The vertical wind speed anomalies indicated that these regions experienced less convection, which reduces the precipitation efficiency of the monsoon system in South Asia.
AbstractList South Asian monsoons were analyzed within the context of increasing emissions of black carbon (BC) aerosols using a global atmospheric general circulation model. The BC aerosols were allowed to increase only over the south Asian domain to analyze the impacts of regional black carbon over the climatological patterns of monsoons. The black carbon significantly absorbed the incoming short wave radiation in the atmosphere, a result that is consistent with previous studies. Pre-monsoon (March-April-May) rainfall showed positive anomalies, particularly for some coastal regions of India. The summer (June-July-August) rainfall anomalies were negative over the northern Himalayas, Myanmar, southern China, and most of the regions below 20°N due to the decrease in temperature gradients induced by the absorption of radiation by BC aerosols. The vertical wind speed anomalies indicated that these regions experienced less convection, which reduces the precipitation efficiency of the monsoon system in South Asia.
P7; South Asian monsoons were analyzed within the context of increasing emissions of black carbon(BC)aerosols using a global atmospheric general circulation model.The BC aerosols were allowed to increase only over the south Asian domain to analyze the impacts of regional black carbon over the climatological patterns of monsoons.The black carbon significantly absorbed the incoming short wave radiation in the atmosphere,a result that is consistent with previous studies.Pre-monsoon(March-April-May)rainfall showed positive anomalies,particularly for some coastal regions of India.The summer(June-July-August)rainfall anomalies were negative over the northern Himalayas,Myanmar,southern China,and most of the regions below 20°N due to the decrease in temperature gradients induced by the absorption of radiation by BC aerosols.The vertical wind speed anomalies indicated that these regions experienced less convection,which reduces the precipitation efficiency of the monsoon system in South Asia.
Author Shuanglin, Li
Jin-Feng, Yao
Mahmood, Rashed
AuthorAffiliation Nansen-Zhu International Research Centre,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China
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  fullname: Jin-Feng, Yao
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SubjectTerms BC aerosols
convection
monsoon
South Asia
temperature gradients
Title Analysis of South Asian Monsoons within the Context of Increasing Regional Black Carbon Aerosols
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